Manufacturing is undergoing significant changes worldwide, and adapting to this transformation poses a considerable challenge. The influence of process parameters was examined with the optimal flow rate for Liquid CO2-assisted MQL to maintain productivity and product quality. In this research work, a new concept has been implemented that the selected flow-rate is greater than the MQL flow-rate and less than the reduce flow-rate. Selected input parameters are crucial for maximizing MRR while considering lower CLA value, rake temperature, and cutting forces. The optimum level settings that yield the desired outcome are a cutting speed of 342 rpm, a feed rate of 20 mm/min, a depth of cut of 0.34 mm, and a flow rate of 10 ml/min. A flow rate of 10 ml/min indicates that the liquid CO2-mixed cutting fluid penetrates the gap between the chip, workpiece, and tool interface, delivering enhanced lubrication at the cutting zone. This study explores the machinability of EN31 alloy steel under Liquid CO2-assisted MQL, offering an understanding that could improve efficiency and sustainability in industrial machining applications.